/*
 * Copyright 2019 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "modules/skottie/src/effects/Effects.h"

#include "modules/skottie/src/SkottieValue.h"
#include "modules/sksg/include/SkSGColorFilter.h"
#include "modules/sksg/include/SkSGPaint.h"
#include "src/utils/SkJSON.h"

namespace skottie {
namespace internal {
namespace {
class TintAdapter final : public AnimatablePropertyContainer {
public:
    static sk_sp<TintAdapter> Make(const skjson::ArrayValue &jprops, sk_sp<sksg::RenderNode> layer,
        const AnimationBuilder &abuilder)
    {
        return sk_sp<TintAdapter>(new TintAdapter(jprops, std::move(layer), abuilder));
    }

    const auto &node() const
    {
        return fFilterNode;
    }

private:
    TintAdapter(const skjson::ArrayValue &jprops, sk_sp<sksg::RenderNode> layer, const AnimationBuilder &abuilder)
        : fColorNode0(sksg::Color::Make(SK_ColorBLACK)),
          fColorNode1(sksg::Color::Make(SK_ColorBLACK)),
          fFilterNode(sksg::GradientColorFilter::Make(std::move(layer), fColorNode0, fColorNode1))
    {
        enum : size_t {
            kMapBlackTo_Index = 0,
            kMapWhiteTo_Index = 1,
            kAmount_Index = 2,
            // kOpacity_Index    = 3, // currently unused (not exported)

            kMax_Index = kAmount_Index,
        };

        EffectBinder(jprops, abuilder, this)
            .bind(kMapBlackTo_Index, fMapBlackTo)
            .bind(kMapWhiteTo_Index, fMapWhiteTo)
            .bind(kAmount_Index, fAmount);
    }

    void onSync() override
    {
        fColorNode0->setColor(fMapBlackTo);
        fColorNode1->setColor(fMapWhiteTo);

        fFilterNode->setWeight(fAmount / 100); // 100-based
    }

    const sk_sp<sksg::Color> fColorNode0, fColorNode1;
    const sk_sp<sksg::GradientColorFilter> fFilterNode;

    ColorValue fMapBlackTo, fMapWhiteTo;
    ScalarValue fAmount = 0;
};
} // namespace

sk_sp<sksg::RenderNode> EffectBuilder::attachTintEffect(const skjson::ArrayValue &jprops,
    sk_sp<sksg::RenderNode> layer) const
{
    return fBuilder->attachDiscardableAdapter<TintAdapter>(jprops, std::move(layer), *fBuilder);
}
} // namespace internal
} // namespace skottie
